Manchester Victoria then a tram at Victoria to Old Trafford, there's no train station near the ground really, only a tram system... which will be packed going there and back, so good luck!

a lot of people assume the only tram option is the Altrincham line & thus the Eccles line is often not as rammed (get off at Exchange Quay) - if you're on the tram, try to get on as near to Piccadilly as poss - anything past St Peter's Square & you'll be riding on the roof

For people who complain about how pack trams get at old Trafford you're better off walking to Trafford bar instead and getting a tram from there that comes on the St Werburghs line as this bypasses old Trafford and doesn't get as packed you can do the same on way to ground as well

Nearest tram stop to old trafford is Pamona.

That line now goes to East Didsbury as its' final stop. Going the other way, it's Rochdale, although it doesn't go into Piccadilly, but does stop at Victoria.
You will need to change at Market Street for Piccadilly, or, as an alternative, walk the 5-10 minutes or so.

Quite the opposite, I won't be going even if we get there. I just don't like it, the corporate is crap (done it 3 or 4 times now) and the evening KO gives too many idiots the chance to get ed, resulting in much unsavouriness. I hope you have a great time though!